<template>
  <div id="aCoursesList" class="bg-fa of">
    <!-- /课程列表 开始 -->
    <section class="container">
      <header class="comm-title">
        <h2 class="fl tac">
          <span class="c-333">全部课程</span>
        </h2>
      </header>
      <section class="c-sort-box">
        <section class="c-s-dl">
          <dl>
            <dt>
              <span class="c-999 fsize14">课程类别</span>
            </dt>
            <dd class="c-s-dl-li">
              <ul class="clearfix">
                <li>
                  <a title="全部" href="#" @click="showAllCourse()" :class="{active:oneIndex===-1}">全部</a>
                </li>
                <!--  一级分类列表  -->
                <li :key="index" v-for="(item,index) in subjectNestedList" :class="{active:oneIndex===index}">
                  <a :title="item.title" href="#" @click="searchOne(item.id,index,item)" :class="{active:oneIndex===index}">{{item.title}}</a>
                </li>
              </ul>
            </dd>
          </dl>
          <dl>
            <dt>
              <span class="c-999 fsize14"></span>
            </dt>
            <dd class="c-s-dl-li">
              <ul class="clearfix">
                <!-- 二级分类列表 -->
                <li :key="index" v-for="(item,index) in subSubjectList" :class="{active:twoIndex===index}">
                  <a :title="item.title" href="#" @click="searchTwo(item.id,index)" :class="{active:twoIndex===index}">{{item.title}}</a>
                </li>
              </ul>
            </dd>
          </dl>
          <div class="clear"></div>
        </section>
        <div class="js-wrap">
          <section class="fr">
            <span class="c-ccc">
              <i class="c-master f-fM">1</i>/
              <i class="c-666 f-fM">1</i>
            </span>
          </section>
          <section class="fl">
            <ol class="js-tap clearfix">
              <li :class="{'current bg-orange':buyCountSort!==''}">
                <a title="销量" href="javascript:void(0);" @click="searchBuyCount()">销量
                  <span :class="{hide:buyCountSort===''}">↓</span>
                </a>
              </li>
              <li :class="{'current bg-orange':gmtCreateSort!==''}">
                <a title="最新" href="javascript:void(0);" @click="searchGmtCreate()">最新
                  <span :class="{hide:gmtCreateSort===''}">↓</span>
                </a>
              </li>
              <li :class="{'current bg-orange':priceSort!==''}">
                <a title="价格" href="javascript:void(0);" @click="searchPrice()">价格&nbsp;
                  <span :class="{hide:priceSort===''}">↓</span>
                </a>
              </li>
            </ol>
          </section>
        </div>
        <div class="mt40">
          <!-- /无数据提示 开始-->
          <section v-if="data.total===0" class="no-data-wrap" >
            <em class="icon30 no-data-ico">&nbsp;</em>
            <span class="c-666 fsize14 ml10 vam">没有相关数据，小编正在努力整理中...1</span>
          </section>
          <!-- /无数据提示 结束-->
          <article class="comm-course-list" v-if="data.total>0">
            <ul class="of" id="bna">
              <li :key="index" v-for="(item,index) in data.items">
                <div class="cc-l-wrap">
                  <section class="course-img">
                    <img :src="item.cover" class="img-responsive" :alt="item.title">
                    <div class="cc-mask">
                      <a :href="'/course/'+item.id" title="开始学习" class="comm-btn c-btn-1">开始学习</a>
                    </div>
                  </section>
                  <h3 class="hLh30 txtOf mt10">
                    <a :href="'/course/'+item.id" :title="item.title" class="course-title fsize18 c-333" >{{item.title}}</a>
                  </h3>
                  <section class="mt10 hLh20 of">
                    <span class="fr jgTag bg-green" v-if="Number(item.price)<=0">
                      <i class="c-fff fsize12 f-fA">免费</i>
                    </span>
                    <span class="fr jgTag bg-green" v-else>
                      <i class="c-fff fsize12 f-fA">{{item.price}}元</i>
                    </span>
                    <span class="fl jgAttr c-ccc f-fA">
                      <i class="c-999 f-fA">{{item.viewCount}}次浏览</i>
                      |
                      <i class="c-999 f-fA">{{item.buyCount}}次购买</i>
                    </span>
                  </section>
                </div>
              </li>
            </ul>
            <div class="clear"></div>
          </article>
        </div>
        <!-- 公共分页 开始 -->
        <div>
          <div class="paging">
            <!-- undisable这个class是否存在，取决于数据属性hasPrevious -->
            <a
              :class="{undisable: !data.hasPrevious}"
              href="#"
              title="首页"
              @click.prevent="gotoPage(1)">首</a>
            <a
              :class="{undisable: !data.hasPrevious}"
              href="#"
              title="前一页"
              @click.prevent="gotoPage(data.current-1)">&lt;</a>
            <a
              v-for="page in data.pages"
              :key="page"
              :class="{current: data.current === page, undisable: data.current === page}"
              :title="'第'+page+'页'"
              href="#"
              @click.prevent="gotoPage(page)">{{ page }}</a>
            <a
              :class="{undisable: !data.hasNext}"
              href="#"
              title="后一页"
              @click.prevent="gotoPage(data.current+1)">&gt;</a>
            <a
              :class="{undisable: !data.hasNext}"
              href="#"
              title="末页"
              @click.prevent="gotoPage(data.pages)">末</a>
            <div class="clear"/>
          </div>
        </div>
        <!-- 公共分页 结束 -->
      </section>
    </section>
    <!-- /课程列表 结束 -->
  </div>
</template>

<script>
  import course from '../../api/course'
export default {
  name: "index",
  data(){
    return{
      page:1,//当前页
      data:{},//课程列表
      subjectNestedList: [], // 一级分类列表
      subSubjectList: [], // 二级分类列表
      searchObj: {}, // 查询表单对象
      oneIndex:-1,
      twoIndex:-1,
      buyCountSort:"",
      gmtCreateSort:"",
      priceSort:""
    }
  },
  created(){
    //课程第一次查询
    this.initCourseFirst()
    //一级分类显示
    this.initSubject()
  },
  methods:{
    //1.查询第一页的数据
    initCourseFirst(){
      course.getCourserList(1,8,this.searchObj).then(respone=>{
        this.data=respone.data.data
      }).catch(()=>{
        this.$message.error('获取数据失败')
      })
    },
    //2.查询所有分类
    initSubject(){
      course.getAllSubject().then(respone=>{
        this.subjectNestedList=respone.data.data.list
      }).catch(()=>{
        this.$message.error('查询所有分类失败')
      })
    },
    //分页切换的方法
    gotoPage(page){
      course.getCourserList(page,8,this.searchObj).then(respone=>{
        this.data=respone.data.data
      }).catch(()=>{
        this.$message.error('获取数据失败')
      })
    },
    //点击一级分类查询对应二级分类
    searchOne(id,index,item){
      //点击某个一级分类进行查询
      this.searchObj.subjectParentId = id;
      this.gotoPage(1)
      //显示二级分类
      this.subSubjectList=item.children
      //修改点击后的样式
      this.oneIndex=index
    },
    //点击某个二级分类实现查询
    searchTwo(id,index){
      this.twoIndex=index
      //点击某个二级分类进行查询
      this.searchObj.subjectId = id;
      this.gotoPage(1)
    },
    //销量排序
    searchBuyCount(){
      //设置对应变量的值，为了样式生效
      this.buyCountSort = 'ooo'
      this.gmtCreateSort=''
      this.priceSort=''
      //将值赋值到searchObj中
      this.searchObj.gmtCreateSort=null
      this.searchObj.priceSort=null
      this.searchObj.buyCountSort = this.buyCountSort
      //调用方法查询
      this.gotoPage(1)
    },
    //发布时间排序
    searchGmtCreate(){
      //设置对应变量的值，为了样式生效
      this.buyCountSort = ''
      this.gmtCreateSort='ww'
      this.priceSort=''
      this.searchObj.gmtCreateSort=this.gmtCreateSort
      this.searchObj.priceSort=null
      this.searchObj.buyCountSort = null
      //调用方法查询
      this.gotoPage(1)
    },
    //价格排序
    searchPrice(){
      //设置对应变量的值，为了样式生效
      this.buyCountSort = ''
      this.gmtCreateSort=''
      this.priceSort='www'
      this.searchObj.priceSort=this.priceSort
      this.searchObj.buyCountSort = null
      this.searchObj.gmtCreateSort=null
      //调用方法查询
      this.gotoPage(1)
    },
    //显示全部课程
    showAllCourse(){
      this.searchObj= {}
      this.gotoPage(1)
      this.oneIndex=-1
      this.twoIndex=-1
    }
  }
}
</script>

<style scoped>
  .active {
    background: #bdbdbd;
    color:#ff3116;
    font-weight: 500;
  }
  .hide {
    display: none;
  }
  .show {
    display: block;
  }
</style>
